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Research on Ultrasonic Inspection and Signal Analysis of Great Thickness EBW Seam

Author: HuZuoPing
Tutor: ShiYiWei；LuChao
School: Nanchang University of Aeronautics and
Course: Measuring Technology and Instruments
Keywords: Electron beam welding Multi-zone focus detection technology The relationship between the defect and the signal Finite Element Method
CLC: TG441.7
Type: Master's thesis
Year: 2010
Downloads: 90
Quote: 0
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Abstract


The electron beam welding is a complex high - temperature smelting processes, due to the fluctuations of process parameters in the welding process , will produce pores, incomplete penetration and other defects . These defects have a great influence on the mechanical properties of the weld , non-destructive testing must be able to effectively detect these defects ultrasonic signals of different defects , accurate assessment of defects in electron beam welding , however, in this aspects less information . To solve the above problem , this paper application of electron beam welding defects ultrasonic signal and the actual size relationship in a multi- zone focus . First, using ultrasonic multi-zone focusing techniques to detect the thickness of the electron beam welds containing natural defects , typical defects in the anatomy and comparative analysis of the same defects in ultrasonic testing specimen thickness in the thesis process results , the results show that the same defects in the different thickness of the specimen from the ultrasound test results verify the large thickness of the electron beam welding , ultrasonic detection capabilities . Secondly, the introduction of the finite element method to establish numerical calculation model of ultrasonic testing of common defects in titanium alloy . Through numerical simulation study the ultrasonic the inverse scattering characteristics on the defects , and defects of the amplitude of the reflected wave analysis to understand the impact of different types and size of defects in ultrasound inverse scattering simulation results and experimental results are compared with good agreement . Finally, the anatomy of actual defects with the corresponding ultrasonic . From the nature of the defect with respect to the orientation of the incident acoustic beam , and the burial depth in the specimen , etc. , were analyzed in the electron beam welding defects and the relationship of the ultrasound signal . In short , multi-zone focus detection technology can detect the large thickness of the electron beam welding , the actual defect and the relationship of the ultrasonic signal is more in line with the general laws , which provided the basis for the large thickness of the electron beam weld quality evaluation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > General approach > Welding defects and quality inspection
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